Front-end limiter circuits using Schottky and PIN diodes can provide needed protection in communications and other RF systems. However, designers still must deal with the upper-frequency limit problem. Synchronous or asynchronous transmissions can overload the front end of a wireless communication receiver.1 In time-domain duplexed systems, imperfect isolation between ports of a switch or a circulator is responsible for synchronous overload, whereas the asynchronous overload arises from unintended coupling between co-located aerials of unrelated systems.Register or Sign in below to download the full article in .PDF format, including high resolution graphics and schematics.
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